Description from Open Library:

standing on the fringes of life... offers a unique perspective. But there comes a time to see what it looks like from the dance floor. This haunting novel about the dilemma of passivity vs. passion marks the stunning debut of a provocative new voice in contemporary fiction: The Perks of Being A WALLFLOWER This is the story of what it's like to grow up in high school. More intimate than a diary, Charlie's letters are singular and unique, hilarious and devastating. We may not know where he lives. We may not know to whom he is writing. All we know is the world he shares. Caught between trying to live his life and trying to run from it puts him on a strange course through uncharted territory. The world of first dates and mixed tapes, family dramas and new friends. The world of sex, drugs, and The Rocky Horror Picture Show, when all one requires is that the perfect song on that perfect drive to feel infinite. Through Charlie, Stephen Chbosky has created a deeply affecting coming-of-age story, a powerful novel that will spirit you back to those wild and poignant roller coaster days known as growing up. (back cover)

Description from Google Books:

Read the cult-favorite coming of age story that takes a sometimes heartbreaking, often hysterical, and always honest look at high school in all its glory. Now a major motion picture starring Logan Lerman and Emma Watson, The Perks of Being a Wallflower is a funny, touching, and haunting modern classic. The critically acclaimed debut novel from Stephen Chbosky, Perks follows observant “wallflower” Charlie as he charts a course through the strange world between adolescence and adulthood. First dates, family drama, and new friends. Sex, drugs, and The Rocky Horror Picture Show. Devastating loss, young love, and life on the fringes. Caught between trying to live his life and trying to run from it, Charlie must learn to navigate those wild and poignant roller-coaster days known as growing up. A years-long #1 New York Times bestseller, an American Library Association Best Book for Young Adults and Best Book for Reluctant Readers, and with millions of copies in print, this novel for teen readers (or “wallflowers” of more-advanced age) will make you laugh, cry, and perhaps feel nostalgic for those moments when you, too, tiptoed onto the dance floor of life.

Snippet from Google Books:

A years-long #1 New York Times bestseller, an American Library Association Best Book for Young Adults and Best Book for Reluctant Readers, and with millions of copies in print, this novel for teen readers (or “wallflowers” of more ...

Description from Harvard Library:

A tale of adolescence whose hero is Charlie, a high school freshman in Pennsylvania. The novel follows Charlie as he is introduced to love, literature and pot. A debut in fiction by a filmmaker.